Method and apparatus for processing brightness of display screen

Patent metadata

Field	Value
Publication number	US-11527219-B2
Application number	US-202117560205-A
Country	US
Kind code	B2
Filing date	Dec 22, 2021
Priority date	Mar 29, 2021
Publication date	Dec 13, 2022
Grant date	Dec 13, 2022

Abstract

Examples of the present disclosure provide a method and an apparatus for processing a brightness of a display screen, and an electronic device. The method includes: obtaining a subject object of an image based on image information of the image; obtaining a first contrast of the subject object and a first gray level of the image; and adjusting a brightness of a display screen displaying the image based on the first contrast and the first gray level.

First claim

What is claimed is:

1. A method for processing a brightness of a display screen, comprising:
obtaining a subject object of an image based on image information of the image;
obtaining a first contrast of the subject object and a first gray level of the image;
adjusting a brightness of the display screen displaying the image based on the first contrast and the first gray level; and
in response to an ambient brightness being less than a predetermined brightness, the first gray level being greater than a predetermined gray level and the first contrast being greater than a predetermined contrast, maintaining the brightness of the display screen unchanged.

2. The method of claim 1 , wherein adjusting the brightness of the display screen displaying the image based on the first contrast and the first gray level comprises:
in response to the ambient brightness being less than the predetermined brightness, adjusting the brightness of the display screen displaying the image based on the ambient brightness, the first contrast and the first gray level.

3. The method of claim 2 , wherein in response to the ambient brightness being less than the predetermined brightness, adjusting the brightness of the display screen displaying the image based on the ambient brightness, the first contrast and the first gray level, comprises one of:
in response to the ambient brightness being less than the predetermined brightness, the first gray level being greater than a predetermined gray level and the first contrast being within a predetermined contrast range, adjusting the brightness of the display screen based on the ambient brightness and the first gray level; and
in response to the ambient brightness being less than the predetermined brightness, the first gray level being less than or equal to the predetermined gray level and the first contrast being within the predetermined contrast range, adjusting the brightness of the display screen based on the ambient brightness and the first gray level,
wherein a maximum contrast of the predetermined contrast range is less than the predetermined contrast.

4. The method of claim 3 , wherein adjusting the brightness of the display screen based on the ambient brightness and the first gray level comprises:
determining that the brightness of the display screen is positively correlated with the ambient brightness and positively correlated with the first gray level.

5. The method of claim 2 , wherein in response to the ambient brightness being less than the predetermined brightness, adjusting the brightness of the display screen displaying the image based on the ambient brightness, the first contrast and the first gray level, comprises:
in response to the ambient brightness being less than the predetermined brightness, the first gray level being less than or equal to a predetermined gray level and the first contrast is greater than a predetermined contrast, adjusting the brightness of the display screen based on the ambient brightness, the first contrast and the first gray level.

6. The method of claim 5 , wherein adjusting the brightness of the display screen based on the ambient brightness, the first contrast and the first gray level comprises:
determining that the brightness of the display screen is positively correlated with the ambient brightness, positively correlated with the first gray level and inversely correlated with the first contrast.

7. The method of claim 1 , wherein when the image comprises at least two subject objects, obtaining the first contrast of the subject object comprises:
obtaining the first contrast of the subject objects of the image based on a contrast of each subject object and a weight coefficient corresponding to each subject object.

8. The method of claim 7 , wherein the obtaining the first contrast of the subject objects of the image based on the contrast of each subject object and the weight coefficient corresponding to each subject object comprises:
obtaining a first value based on a product of the contrast of the subject object and the corresponding weight coefficient of the subject object; and
obtaining the first contrast of the subject objects of the image based on a sum of the first values of respective subject objects.

9. The method of claim 8 , wherein the weight coefficient corresponding to each subject object is determined based on at least one of an importance degree of different types of subject objects, an area of the subject object in the image, and a position of the subject object in the image.

10. An electronic device, comprising:
at least one processor; and
a memory configured to store instructions executable by the at least one processor;
wherein the at least one processor is configured to run the executable instructions, so as to perform operations of:
obtaining a subject object of an image based on image information of the image;
obtaining a first contrast of the subject object and a first gray level of the image;
adjusting a brightness of a display screen displaying the image based on the first contrast and the first gray level; and
in response to an ambient brightness being less than a predetermined brightness, the first gray level being greater than a predetermined gray level and the first contrast being greater than a predetermined contrast, maintaining the brightness of the display screen unchanged.

11. The electronic device of claim 10 , wherein the at least one processor is configured to perform operations of:
in response to the ambient brightness being less than the predetermined brightness, adjusting the brightness of the display screen displaying the image based on the ambient brightness, the first contrast and the first gray level.

12. The electronic device of claim 11 , wherein the at least one processor is configured to perform operations of:
in response to the ambient brightness being less than the predetermined brightness, the first gray level being greater than a predetermined gray level and the first contrast being within a predetermined contrast range, adjusting the brightness of the display screen based on the ambient brightness and the first gray level; or
in response to the ambient brightness being less than the predetermined brightness, the first gray level being less than or equal to the predetermined gray level and the first contrast being within the predetermined contrast range, adjusting the brightness of the display screen based on the ambient brightness and the first gray level,
wherein a maximum contrast of the predetermined contrast range is less than the predetermined contrast.

13. The electronic device of claim 12 , wherein the at least one processor is configured to perform operations of:
determining that the brightness of the display screen is positively correlated with the ambient brightness and positively correlated with the first gray level.

14. The electronic device of claim 11 , wherein the at least one processor is configured to perform operations of:
in response to the ambient brightness being less than the predetermined brightness, the first gray level being less than or equal to a predetermined gray level and the first contrast is greater than a predetermined contrast, adjusting the brightness of the display screen based on the ambient brightness, the first contrast and the first gray level.

15. The electronic device of claim 14 , wherein the at least one processor is configured to perform operations of:
determining that the brightness of the display screen is positively correlated with the ambient brightness, positively correlated with the first gray level and inversely corre

Assignees

• Beijing Xiaomi Mobile Software Co Ltd

Inventors

• Jia Yongqiang
• Gu Xiaowei

Classifications

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G5/10 Primary

  Intensity circuits · CPC title

• G09G2320/0626

  for control of overall brightness · CPC title

• G09G2320/0686

  with two or more screen areas displaying information with different brightness or colours · CPC title

• G09G2360/144

  the light being ambient light · CPC title